Dec. is, 1925 Mineral Composition of Sunflowers Grown for Silage 1195 
The seven-year average on continuously cropped land shows a yield 
of 2034 bushels of spring wheat as against 32 % bushels on the alter¬ 
nate fallow and crop land. The average protein content of both 
spring and winter wheat produced on the continuously cropped land 
is much lower than it is in the spring and winter wheat produced on 
the alternate fallow and crop. 
Fig. 2—Nitrate nitrogen found in the soil of several plots at different periods of plant growth 
'Table III. — Yield per acre and protein content of wheat on plots continuously 
cropped and plots alternately fallow^and cropped {seven-year average) 
Plots continuously 
cropped 
Plots alternately fallow 
and cropped 
Bushels 
Percentage 
of protein 
Bushels 
Percentage 
of protein 
Winter wheat___ 
. 24 J* 
20K 
11.91 
11.63 
40K 
32 H 
14.13 
15.90 
Spring wheat____ __ ... 
From a study of the graphs showing moisture and nitrates it seems 
hardly possible that any of the differences which appear in the 
